Combination drawing-instrument



(No Model.)

J. MOMASTERS SCOTT COMBINATION DRAWING INSTRUMENT.

Patented Odt. 21, 1884.

INVENTOR: 7%770 25M BY Mm f r WITNESSES: m fw 157% ATTORNEYS.

' UNITED STATES FFICEQ- ATENT COMBINATION DRAWlNG-lNSTRUMENT.

rjl-LCIPICATION forming part of Letters Patent No. 306,869, dated October 21, 1884.

Application tiled Mari-h To 17/ 111 cm I nmy/eonmmvt:

Be it known that I, JOSEPH MOM. 8001 1, of Allegheny City, inthecountyofA llegheny and Stateoflennsylvania,haveinventedanewand i Improved Combination Drawing Instrument, of which the following is a full, clear, and exl art description. v I

My invention consists of a triangle having the margins f gured with different scales. for different purposes, and having another triangle, a protractor, several irregular curves, circles, ovals, and other figures cut in it within the margins, and thereby enabling one in- 5 st rument to serve the purposes of many single instru ments separately made,as hereinafter fully deseribed.

Reference is to be had to the accompanying drawingftorming part of this specification, in which the figure represents my improved drawing instrument in plan view.

I make a triangle, a, preferably of forty-five degrees and ninety degrees, and of approved size. preferably so that a one-foot scale. b, may be made on the margin of one side. preferably the long one, and I mark said scale thereon, and mark other scales, as c d, for draftsmen, architects. and others, on the other margins, making six different scales, if desired, or repeating some for convenience, if preferred, and within the margins of the triangle a I cut out sufficient material to form a smaller r f. g. h, 17, and It, and also the he trt-shaped instruments.

[3, 1884. lNo model.)

triangle, e, preferably of sixty and ninety degrees. within the lines of which I retain portions of the plate to form different curves. as

35 figure Z. In the remalmng space between the margins ofthe trianglea', 1 form the protractor l m, right angle squaren, ellipse 0, circle p, ir-

regular curves q. s, and t, trefoil u, and the shield-figure n. all affording lines and shapes useful in the draftsmans art, and, being thus combined in'on'e inst runient, are. more eonvenient tor use, and may be provided cheaperthan as commonly made in several separate 45 Having thus described my inventiomWhatI claim as new, and desire to secure by Letters Patent. is-

1. The improved combination-instrument, consisting of a triangle, (1. having marginal scales b 0d, triangle 0, protractor m, ellipse 0, circle p, irregular curves q s t, trefoil u, and the shield figure a. substantially as describ.-d.

2. The improved ecmbination-instrument, consisting of a triangle, a. having another .triaugle, e, and said triangle 6 having curvesf, g, h, i, j, and 7;, substantially as described.

JOSEPH McMASTERS soor'r.

W'itnesses: Y

J NO. H. BENTON, CH. E. CORNELIUS, 

